EA has opened up their beta for the upscoming game Darkspore to everyone, ending their closed beta.  It's free and available for everyone until April 22, so go grab it while it lasts. 

In Darkspore, you play a Crogenitor, former experimenter extrordinare and alterer of genetic material from around the galaxy.  One of your groups' experiments went horribly wrong eons ago and you, now woken from a deep sleep, have to save your world from the abominations known as Darkspore.

Get the free PC beta here.  The game ships April 26.